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6.85 Ct 3D Wood Replacement OpalA stunning 6. 85 Ct wood replacement opal in a classic oval shape. What is Wood Replacement opal? Opal formation commences when silica dissolves in water. At our Russells opal mine we have found that this silica solution occupies a void most probably left by decaying tree roots or branches. In cases where the silica infiltrates organic material before complete decomposition occurs, the organic molecules are replaced by silica. This remarkable process

perfect for a ring or pendant

A beautiful round boulder opal with green veins on a dark ironstone face

the wood structure remains visible within the opal

A lovely light green pair of teardrop boulder opals

A small bright rainbow boulder opal

A beautiful free-form boulder opal with the predominant colours of soft pink and green

A beautiful crystal opal

long arch shaped boulder opal specimen with lovely pinks swirls and a strong white stripe

A lovely 8

It also has a jet black body tone

A beautiful rainbow pair of heart boulder opals

blue and purple colours